How severe is CVE-2000-1139?

CVE-2000-1139 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2000-1139 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2000-1139?

CVE-2000-1139 affects Microsoft Exchange Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2000-1139?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2000-1139 published?

CVE-2000-1139 was published on 2001-01-09 and last updated on 2026-06-16.

CVE-2000-1139

CVE-2000-1139 is a high-severity vulnerability in Microsoft Exchange Server with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-798.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-798
Affected product: Microsoft Exchange Server
Published: 2001-01-09
Last modified: 2026-06-16

Description

The installation of Microsoft Exchange 2000 before Rev. A creates a user account with a known password, which could allow attackers to gain privileges, aka the "Exchange User Account" vulnerability.

Frequently asked questions

What is CVE-2000-1139?: The installation of Microsoft Exchange 2000 before Rev. A creates a user account with a known password, which could allow attackers to gain privileges, aka the "Exchange User Account" vulnerability.
How severe is CVE-2000-1139?: CVE-2000-1139 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2000-1139 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2000-1139?: CVE-2000-1139 affects Microsoft Exchange Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2000-1139?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2000-1139 published?: CVE-2000-1139 was published on 2001-01-09 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:microsoft:exchange_server:2000:-:*:*:*:*:*:*

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